Crank-hanger.



AUNITED STATES PATENT OFFICE.

Specication of Letters Patent.

Patented March 5, 1907.

Application filed Dembel 6. 1906. Serial No. 346,572.

To all whom it may concern.-

Be it known that I, FRANK M. OsBoRNE, aA citizen of the United States,and a resident of Anaconda, in the county of Deerlodge and State ofMontana, have invented certain new and useful Improvements inCrank-Hangers, of which the following is a speciiication.

This invention is an improvement in crank-hangers for bicycles, andconsists in certain novel constructions and combinations of parts, aswill be hereinafter described and claimed.

In the drawings, Figure l is a vertical cross-section of the hanger.Fig. 2 is a transverse section on about the line 2 2 of Fig. l. Fig. 3is a detail perspective view of one of the crank-arms and itsshaft-section, and Fig. 4 is a detail perspective view of the othercrank-arm and its shaft-section.

In carrying out my invention it will be n0- ticed, especially from Fig.l, that the sprocket-wheel pulls between the bearings, and from thefollowing description it will 4-be noticed that the cranks can beconveniently removed when desired without disturbing all oi" the partsof the hanger.

As shown, I employ a bracket A in the form of a split sleeve connectedat its upper side with the seat-post B and split at its lower side andconnected at such side by binding-bolts A. This sleeve A embraces theopposite ball-cups, and when the bolts A are tightened the bracket willclamp the said cups and secure them from turning movement, The ball-cupsD and E screw at their inner ends upon the opposite ends of theadjusting-tube C, said tube being threaded externally at its oppositeends and provided with a limiting-shoulder O' at the inner end of one ofits threaded portions. This shoulder C is abutted by the ball-cup E whenthe latter is screwed home and limits the movement of the said cup alongthe tube C. The other cup D may be turned upon the tube C in securingthe desired adjustment of the cups to hold the balls in proper relationto the cones d and e at the opposite ends of the cone-sleeve F, as shownin Fig.. l. The cone-sleeve F is provided at its ends with shortcylindrical portions f, projecting beyond the cones d and e, theinwardly-projecting end flanges of the cups D and E fitting over thecylindrical portions, so that the joint between the cone-sleeve and theend iianges of the cups will be covered by the washers Gr when thelatter are applied, as

shown in Fig. l of the drawings. These washers Gr turn with the cranks Hand I, tting at their inner edges snugly around the shaft-sections H andI and overlapping at their inner sides the oints between the cups andthe cone-sleeve, thus operatin to prevent the ingress of dust andmaIring the hanger practically dustproof. These washers G may bepreferably of felt; but other suitable well-known packing material maybe used when desired, and when the washers are arranged as shown theywill`be durable and ehicient and may be conveniently renewed wheneverworn, because of the ease with which the cranks can be removed, aspresently described.

The crank I has a shaft-section I', and at the outer end of saidshaft-section I provide the threaded portion i, receiving the dustcap J,which is screwed on with a left-hand thread, so that its revolution withthe crank I upon the ball-cup D will not have a tendency to loosen thethreaded connection of the cap J with its crank-arm. This dust-cap Jencircles the outer end of the ball-cup D and operates to protect suchcup. This ballcup D is provided in its outer side with sockets D toreceive a Spanner-wrench in screwing the cup on and off. The crank H isprovided, surrounding its shaft-section H', with a dust-cap H2, whichiits over the ball-cup E and projects at its inner end to a point insideof the right bearing, and is provided at its inner end with right-handthreads at h2, receiving the sprocket-wheel K, as shownin Fig. 1, so theturning of the crank H in operating the bicycle will not tend to loosenthe said sprocketwheel K, which latter is secured by the lockscrew K',as shown in Fig. 1. Suitable balls L are provided within their cups andbear on the cones of the cone-sleeve, as shown.

The shaft-sections H and I project inwardly toward each other within theconesleeve and interlock at their inner ends by means of the taperedends i' of one section fitting in the tapered recess h of the othersection, and such ends of the sections are bored longitudinally at i3and h3, the bore 'i3 receiving the connecting-bolt M, whose inner end isthreaded into the bore or socket i3 and whose outer end projectingbeyond the outer end of the crank H is threaded to receive the nut M',by which the shaft-sections H and I' are securely held together. Thisconstruction forms a very simple crank-hanger, from which dust will beexcluded and in which the IOO IOS

IIO

UVA-II cranks can be readily removed by simply turning off the nut M andpullingthe shaftsections of the cranks apart, as will be understood fromFig. l of the drawing.

I claim- 1.y The combination substantially as herein described, of thecranks having inwardlyprojecting shaft-sections, one of which has itsend tapered, and the other of which has a tapered recess to receive saidend, such shaftsections being bored longitudinally and one of thesections having its bore threaded, and the bore of the other sectionextending entirely through the saine to the outer side of its crank, andone of the cranks having at the outer end of its shaft-section athreaded portion and a dust-cap screwed thereon, and the other crankhaving` a dust-cap encircling its shaft-section, and a spro`cket-wheelon the inner end thereof, the bolt connecting the shaft-sections andscrewed at one end into the threaded socket of one of said sections andprojecting at its other end outwardly beyond the outer side of the othershaft-section, and threaded at said end, a nut on such end of the bolt,a cone-sleeve encircling the shaftsections, and provided at its endswith cones and with cylindrical portions projecting outwardly beyond thesaine, the adjusting-tube encircling the cone-sleeve, the ball-cupsthreaded at their inner ends on the adjustd ing-sleeve and provided attheir outer ends with the inwardly-projecting end flanges i'ittingaround the cylindrical end portions of the cone-sleeve, the ballswithin4 said cup bearing on the cones of the sleeve, packingwashersturning with the cranks and fitting on the shaft-sections thereon andlapping the joints between the end flanges of the ballcups and thecylindrical portions of the conesleeve, and the bracket consisting of asplit sleeve encircling the opposite ball-cups, and provided withbinding-bolts whereby to be tightened thereon, substantially as and forthe purposes set forth.

2. The combination in a crank-hanger, of the cone-sleeve having thecones and the end portions projecting beyond the same, the ball-cupswith the end flanges fitting at their inner edges on said endextensions, the cranks having the shaft-sections, and the packingwashersfitting over the shaft-sections and overlapping the joints between theends of the oups and the end extensions of the conesleeve, substantiallyas and for the purposes set forth.

FRANK M. OSBORNE. Witnesses:

JOHN W. JAMES, SUSIE STEWART.

